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Lathrobium petruzzielloi sp. n. from Grotta degli Angeli (Picentini Mounts, Cervialto Mount, Acerno, Campania, Italy), the most southern species in the Italian peninsula of this group, is described and compared with L. angelae Bordoni and Magrini, 1996 from Grotta dei diavoli (Matese Monts, Letino, Caserta, Campania, Italy). A map of the distribution of the glyptomeroid Lathrobium Gravehorst, 1802 in the Italian Apennines is presented. The following synonymy is validated: Lathrobium Gravenhorst, 1802 Glyptomerus H. Müller, 1856.